Remove shared_group_membership_auth feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!54894

Consolidate duplicate info re: testing components

See merge request gitlab-org/gitlab!55789

Change default value for isMergeTrain prop

See merge request gitlab-org/gitlab!55780

Fix bad data in projects.has_external_issue_tracker

See merge request gitlab-org/gitlab!53936

Update custom ruleset wording for secret detection docs

See merge request gitlab-org/gitlab!55779

Batch-load vulnerability findings by UUID

See merge request gitlab-org/gitlab!55642

This prevents an N+1 where the StoreReportService
would previously query for a Finding by UUID one-by-one
only to fall back on a different query/creation when
not found.

Instead, we now pre-load findings into a Hash by UUID,
and only fall back in case we haven't already found it.

Add index on pages_deployment_id and deployed to metadata

See merge request gitlab-org/gitlab!55757

it will be used by the pages migration in
only_on_legacy_storage scope

Clean up the install page

See merge request gitlab-org/gitlab!49944

Remove dangling LFS objects from database

See merge request gitlab-org/gitlab!55737

Tidy up this new section for tone and style, including shifting the
instructions over to an ordered list.

Increase memory and cpu in review apps

See merge request gitlab-org/gitlab!55583

Move to btn-confirm from btn-success in admin/deploy_keys directory

See merge request gitlab-org/gitlab!55267

Correct email notifications docs

See merge request gitlab-org/gitlab!55752

Move away from different sections for all the installation
methods, and use a table so that it's easier to parse.

Correctly style Dark Mode application header on profile preferences page

See merge request gitlab-org/gitlab!54575

Fix 500 error for long commit messages

See merge request gitlab-org/gitlab!55320

Rename vulnerability fingerprints indexes

See merge request gitlab-org/gitlab!55552

Renaming the indexes will make renaming the fingeprint_sha256 column
easier

Contributes to https://gitlab.com/gitlab-org/gitlab/-/issues/321862

**Problem**

`Marshal.dump` returns `TypeError (singleton can't be dumped)` for
commit hashes with long commit  messages.

**Solution**

Introduce a 1 KiB limit for commit message on project details page.

Move to btn-confirm from btn-success in admin/appearances directory

See merge request gitlab-org/gitlab!55264

Minor update to container_registry documentation for clarity

See merge request gitlab-org/gitlab!55712

Remove unique index and add composite key index to Security Orchestration

See merge request gitlab-org/gitlab!55521

Only set note visibility_level to if associated with a project

See merge request gitlab-org/gitlab!55111

Fix for any Elasticsearch notes documents which are not associated
with a project (Epic, Personal Snippet)

Collect Dora Daily Metrics [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!55473

Mention proxy issues for tcp_check Rake task

See merge request gitlab-org/gitlab!55596

Modify shell command which configures PostgreSQL repo to match that used in PostgreSQL docs

See merge request gitlab-org/gitlab!54185

Add cluster agent show page

See merge request gitlab-org/gitlab!54106